I found that using MSI Afterburner and playing with the core voltage settings (mine is now at -100), the intensity settings in the miner software, and the powlim settings, that I could reduce power consumption significantly without the loss of much Hashing capability. I measured the power draw with a plug in monitor at the wall.

I'm getting averages 1150/hs with one r9 290 and two r9 Fury's using 600w of power using the stock BIOS.